题解 | #查字典#

dict1 = {
    "a": ["apple", "abandon", "ant"],
    "b": ["banana", "bee", "become"],
    "c": ["cat", "come"],
    "d": "down",
}

word=str(input())

for i,k in dict1.items():
    if i == word:
        for j in k:
            print(j,end=' ')